The following pages contain the solutions for all the problems to be found in Part I of the textbook A First Course in String Theory. The handwritten solutions are all due to Jeffrey Goldstone. They are clear and elegant, and I hope that he will publish them someday. If you distribute some solutions to students please let them know that they are due to Goldstone. The rest of the solutions have been typeset. They were mostly written by me, with some help by Stefanos Marnerides and Ian Ellwood.